Datasheet > 微控制器和处理器 > 计时器或实时时钟> BQ3285L

BQ3285L

更新时间： 2024-11-28 22:27:51

品牌	Logo	应用领域
德州仪器 - TI		时钟
页数	文件大小	规格书
22页	148K
描述
Y2K-Enhanced Real-Time Clock (RTC)

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

BQ3285L 数据手册

bq3285LF

Y2K-Enhanced

(

)

Real-Time Clock RTC

General Description

The bq3285LF write-protects the

clock, calendar, and storage registers

during power failure. A backup

battery then maintains data and oper-

ates the clock and calendar.

Features

The CMOS bq3285LF is a low-power

microprocessor peripheral providing

a time-of-day clock and 100-year cal-

endar with alarm features and bat-

tery operation. The architecture is

based on the bq3285 RTC with added

features: century bit, low-voltage op-

eration, 32.768kHz output, 126 addi-

tional bytes of CMOS, two shadow

registers of last address used, and a

day-of-month alarm to be compliant

with the ACPI RTC specification.

➤ ACPI-compliant day-of-month

alarm

➤ Y2K century bit

The bq3285LF is a fully compatible

real-time clock for IBM AT-

compatible computers and other ap-

plications. The only external compo-

nents are a 32.768kHz crystal and a

backup battery.

➤ Direct clock/calendar replace-

ment for IBM^®AT-compatible

computers and other applications

➤ 2 index shadow registers

➤ 2.7–5.5V operation

The bq3285LF is intended for use in

3V systems; however, it may also op-

erate at 5V and then go into a 3V

power-down state, write-protecting

as if in a 3V system.

➤ 240 bytes of general nonvolatile

storage

A 32.768kHz output is available for

sustaining power-management ac-

tivities. The bq3285LF 32kHz out-

put is always on whenever V_CCis

valid. In V_CCstandby mode, the

32kHz is active, and the bq3285LF

typically draws 100µA. Wake-up ca-

pability is provided by an alarm in-

terrupt, which is active in battery-

backup mode. In battery-backup

mode, current drain is less than

550nA.

➤ Dedicated 32.768kHz output pin

➤ System wake-up capability—

alarm interrupt output active in

battery-backup mode

➤ Less than 0.55µA load under bat-

tery operation

➤ Selectable Intel or Motorola bus

timing

➤ 24-pin plastic SSOP

Pin Connections

Pin Names

AD₀–AD₇Multiplexed address/

data input/output

32K

32.768kHz output

EXTRAM Extended RAM enable

MOT

Bus type select input

Chip select input

Address strobe input

Data strobe input

Read/write input

Interrupt request output

Reset input

MOT

32k

EXTRAM

RCL

RAM clear input

3V backup cell input

Crystal inputs

RCL

X1–X2

V_CC

INT

RST

Supply voltage input

Ground

R/W

INT

RST

V_SS

R/W

24-Pin SSOP

PN3285ED/LD.eps

6/99 B

12 3 4 5 6 7...22

中文翻译

下载PDF

与BQ3285L相关器件

型号	品牌	获取价格	描述	数据表
BQ3285LC	ETC	获取价格	Real-Time Clock (RTC)
BQ3285LCS	ETC	获取价格	Real-Time Clock
BQ3285LCSS	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LCSS-	TI	获取价格	Real-Time Clock (RTC)
BQ3285LCSSTR	TI	获取价格	RTC IC With 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output, 3V Vcc 24-SSOP
BQ3285LD	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSS	TI	获取价格	Real-Time Clock (RTC)
BQ3285LDSSTR	TI	获取价格	Real-Time Clock (RTC)
BQ3285LF	TI	获取价格	Y2K-Enhanced Real-Time Clock (RTC)
BQ3285LFSS	TI	获取价格	0 TIMER(S), REAL TIME CLOCK, PDSO24, 0.150 INCH, PLASTIC, SSOP-24

与BQ3285L相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

51
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

41
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

69
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

65

产品中心

服务支持

精选活动

关于我们

帮助中心

BQ3285L

BQ3285L 数据手册

与BQ3285L相关器件

与BQ3285L相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

BQ3285L

BQ3285L 数据手册

与BQ3285L相关器件

与BQ3285L相关文章

您还可以找

您在本页遇到什么问题？